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Texas Instruments LM336M-2.5
- Part No.:
- LM336M-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM336M-2.5.pdf
- Description:
- IC VREF SHUNT 4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,947
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Product details
Overview
LM336M-2.5 from Texas Instruments (formerly National Semiconductor) is a precision 2.5V shunt voltage reference diode in SO-8 package, featuring 0.2Ω dynamic impedance, ±1% initial tolerance, and guaranteed temperature stability over 0°C to +70°C. It operates as a low-temperature-coefficient zener replacement in analog front-ends, ADC reference buffers, and 5V-supply-derived calibration circuits.
For engineers reviewing the LM336M-2.5 datasheet, LM336M-2.5 pinout, LM336M-2.5 application, or LM336M-2.5 equivalent, key selection criteria include its 400 µA–10 mA operating current range, trimmable reference voltage, SO-8 surface-mount compatibility, and guaranteed 7.5 mV max temperature drift across 0°C to +70°C.
Technical Context
The LM336M-2.5 functions as a two-terminal shunt regulator with third-terminal trimming capability-though the SO-8 variant uses only two active terminals (Anode and Cathode); the third terminal (Adjust) is internally connected and not externally accessible per M08A package configuration. Its operation relies on bandgap-derived zener-like breakdown with low dynamic impedance for stable regulation under varying load currents.
Unlike series references, it requires an external current-setting resistor and sinks current to maintain 2.5V at the cathode. Its thermal design leverages θJA = 165°C/W (SO-8), enabling stable performance in compact PCB layouts without forced airflow or heatsinking in industrial-grade ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V typical at 1 mA; ±1% initial tolerance ensures ≤25 mV absolute error in factory-calibrated systems. |
| Dynamic Impedance | 0.2 Ω typical at 1 mA/100 Hz; enables <1 mV output variation under 100 µA load transients. |
| Operating Current Range | 400 µA to 10 mA; supports ultra-low-power sensor biasing and high-current reference buffering without external amplification. |
| Temperature Stability | 7.5 mV max over 0°C to +70°C (LM336M grade); guarantees ≤±3 mV drift in commercial-temperature embedded instrumentation. |
| Long-Term Stability | 20 ppm after 1000 hrs at 25°C; maintains calibration integrity in metering and test equipment with multi-year field deployment. |
| Package | SO-8 (NS M08A); RoHS-compliant, surface-mountable, compatible with standard reflow profiles (215°C vapor phase, 220°C IR). |
Pinout & Package
LM336M-2.5 is housed in an 8-pin Small Outline (SO-8) package per NS Package Number M08A. Only two pins are electrically active: Pin 1 (Cathode) and Pin 8 (Anode). Pins 2–7 are NC (no connect) and internally unconnected - confirmed by schematic diagram (DS005715, Fig. 00571501) and physical dimensions drawing (p.10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Output node where regulated 2.5V appears; must be decoupled with ≥100 nF capacitor to ground for noise immunity. |
| Pin 8 | Anode | Current sink return path; connects to system ground or negative rail when used as negative reference. |
| Pins 2–7 | No Connect (NC) | Internally unconnected; no routing or soldering required; may be left floating or tied to ground for mechanical stability only. |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 0.2 Ω enables sub-millivolt regulation error during fast load steps - critical for high-resolution ADC reference rails. |
| Wide operating current | 400 µA–10 mA range allows direct use with microcontroller GPIOs (as current source) or high-current op-amp drivers without external gain stages. |
| Trimmed temperature coefficient | Guaranteed 7.5 mV max drift over 0°C–70°C eliminates need for external compensation networks in commercial-grade data loggers. |
| SO-8 surface-mount compatibility | M08A footprint supports automated assembly and thermal reliability up to 100°C junction temperature in enclosed enclosures. |
Applications
| Digital Multimeter Reference | 5V-Supplied ADC Calibration |
|---|---|
|
Use Scenario: Portable handheld DMM requiring stable 2.5V reference for 16-bit SAR ADC conversion across battery discharge cycles. IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric accuracy against internal ADC reference buffer. Use Value: 0.2Ω dynamic impedance suppresses supply ripple-induced errors; ±1% tolerance avoids factory calibration offsets. |
Use Scenario: Industrial PLC analog input module powered from 5V rail, digitizing 0–10V sensor signals with ±0.1% full-scale accuracy. IC Role / Device Role / Timing Role: Precision 2.5V reference for differential ADC reference pair, enabling true-ratiometric measurement. Use Value: Guaranteed 7.5 mV tempco over 0°C–70°C ensures calibration holds across enclosure temperature swings without software correction. |
| Op-Amp Clamp Circuit | Bipolar Output Reference Generator |
|
Use Scenario: Audio line driver using rail-to-rail op-amp with output clamped to ±2.5V for headroom control in 5V single-supply systems. IC Role / Device Role / Timing Role: Cathode-referenced shunt clamp establishing precise positive rail limit; Anode grounded for negative clamp symmetry. Use Value: Fast turn-on and low impedance prevent overshoot during transient clipping; SO-8 layout minimizes parasitic inductance. |
Use Scenario: Signal generator IC requiring symmetrical ±2.5V reference for DAC output stage biasing in test equipment. IC Role / Device Role / Timing Role: Dual-role reference: Cathode used for +2.5V, Anode used (with inverted supply) for −2.5V generation via mirrored topology. Use Value: Identical electrical specs between polarity configurations ensure matched offset and drift - validated in Application Note Figure 00571518. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | Programmable 2.495V reference (adjustable via resistors); higher 0.22Ω dynamic impedance; wider 1–100 mA operating range. | Requires external resistor network for 2.5V setting; lacks guaranteed tempco spec below 1 mA; better suited for adjustable regulator feedback. | Select TL431ACDR when programmability or higher current drive (>10 mA) is needed; LM336M-2.5 preferred for fixed 2.5V with tighter tempco guarantee. |
| REF3025AIDBZR | Series reference; 2.500V output; 50 ppm/°C max tempco; 50 µA quiescent current; requires bypass cap and load regulation support. | Three-terminal architecture demands dedicated VIN, VOUT, GND routing; unsuitable for shunt-based topologies or negative reference use. | Select REF3025AIDBZR for low-quiescent, high-PSRR applications where supply headroom permits; LM336M-2.5 remains optimal for shunt flexibility and bipolar operation. |
Compared with TL431ACDR and REF3025AIDBZR, the LM336M-2.5 uniquely supports both positive and negative reference configurations without circuit redesign, delivers lower dynamic impedance at low currents (<1 mA), and provides factory-guaranteed temperature stability over its rated range - making it the preferred choice for cost-sensitive, space-constrained shunt reference designs.
Availability
LM336M-2.5 is available at Aetrix Electronics and suitable for digital multimeters, 5V-supplied ADC calibration circuits, op-amp clamp circuits, and bipolar output reference generators requiring stable component supply across commercial temperature ranges.
Supply support for LM336M-2.5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments (TI) is a global semiconductor leader delivering analog and embedded processing solutions, with heritage in precision analog ICs dating to National Semiconductor's acquisition in 2011.
The LM336M-2.5 belongs to TI's legacy voltage reference product line, designed specifically for cost-effective, high-stability shunt reference applications in commercial-grade instrumentation, power management, and signal conditioning systems.
FAQ
What is the maximum operating temperature range for the LM336M-2.5?
The LM336M-2.5 is rated for operation from 0°C to +70°C ambient temperature, with a maximum junction temperature of 100°C. Its thermal resistance θJA is 165°C/W in the SO-8 package, allowing reliable operation in enclosed industrial enclosures without forced cooling when power dissipation remains below 300 mW.
Does the LM336M-2.5 require an external trimming potentiometer?
No - the LM336M-2.5 in SO-8 package does not provide external access to the adjustment terminal; trimming is performed at wafer level. Unlike the TO-92 or TO-46 variants (e.g., LM136H-2.5), the M-suffix devices are factory-trimmed to ±1% tolerance and intended for fixed-voltage use without user adjustment.
Can the LM336M-2.5 be used as a negative voltage reference?
Yes - the LM336M-2.5 operates as a bidirectional shunt device: connecting its Anode (Pin 8) to a negative rail and Cathode (Pin 1) to ground yields a stable −2.5V reference. This configuration is explicitly supported in the datasheet's "Bipolar Output Reference" application (Figure 00571518) and requires no topology changes.
What is the minimum operating current for stable regulation of the LM336M-2.5?
The LM336M-2.5 maintains regulation down to 400 µA, verified across its full 0°C to +70°C range. Below this current, dynamic impedance rises sharply and reference voltage deviates beyond specification - so the external current-setting resistor must ensure ≥400 µA under worst-case (low-VIN, high-temp) conditions.
Is the LM336M-2.5 RoHS compliant and lead-free?
Yes - the LM336M-2.5 is RoHS compliant and lead-free, consistent with TI's Banned Substances Compliance policy (CSP-9-111S2). The SO-8 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), supporting standard reflow profiles without preconditioning.
LM336M-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.49V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM336M-2.5 FAQ
1.How can I place an order for LM336M-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336M-2.5 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM336M-2.5 reliable?
The price and inventory of LM336M-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM336M-2.5 is usually 5 days.
3.What payment methods are accepted for LM336M-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336M-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336M-2.5?
LM336M-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336M-2.5 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM336M-2.5?
For technical support, including LM336M-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336M-2.5 requirements.
6.How does Aetrix verify that LM336M-2.5 is sourced from the original manufacturer or authorized distributors?
All LM336M-2.5 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM336M-2.5 meets industry standards.
7.What is the process for return or replacement of LM336M-2.5?
All LM336M-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM336M-2.5, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM336M-2.5 part is unused and in its original packaging.
Return procedure for LM336M-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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